Membership in the United Nations is open to all peace-loving states which accept the obligations contained in the present Charter and, in the judgement of the Organization, are able and willing to carry out these obligations.

The admission of any such state to membership in the United Nations will be effected by a decision of the General Assembly upon the recommendation of the Security Council.

A recommendation for admission from the Security Council requires affirmative votes from at least nine of the council's fifteen members, with none of the five permanent members using their veto power. The Security Council's recommendation must then be approved in the General Assembly by a two-thirds majority vote.[4]

In principle, only sovereign states can become UN members, and currently all UN members are sovereign states. Although five members were not sovereign when they joined the UN, all subsequently became fully independent between 1946 and 1991. Because a state can only be admitted to membership in the UN by the approval of the Security Council and the General Assembly, a number of states that are considered sovereign according to the Montevideo Convention are not members of the UN. This is because the UN does not consider them to possess sovereignty, mainly due to the lack of international recognition or due to opposition from one of the permanent members.

New Zealand, while de facto sovereign at that time, "only gained full capacity to enter into relations with other states in 1947 when it passed the Statute of Westminster Adoption Act. This occurred 16 years after the British Parliament passed the Statute of Westminster Act in 1931 that recognised New Zealand's autonomy. If judged by the Montevideo Convention criteria, New Zealand did not achieve full de jure statehood until 1947."[10]

The member states can be sorted by their official designations and dates of admission by clicking on the buttons in the header of the columns. See related sections on former members by clicking on the links in the column See also.

By the 1970s, a shift had occurred in international diplomatic circles and the PRC had gained the upper hand in international diplomatic relations and recognition count. On 25 October 1971, the 21st time the United Nations General Assembly debated on the PRC's admission into the UN,[19]United Nations General Assembly Resolution 2758 was adopted, by which it recognized that "the representatives of the Government of the People's Republic of China are the only lawful representatives of China to the United Nations and that the People's Republic of China is one of the five permanent members of the Security Council," and decided "to restore all its rights to the People's Republic of China and to recognize the representatives of its Government as the only legitimate representatives of China to the United Nations, and to expel forthwith the representatives of Chiang Kai-shek from the place which they unlawfully occupy at the United Nations and in all the organizations related to it."[20] This effectively transferred the seat of China in the UN, including its permanent seat on the Security Council, from the ROC to the PRC, and expelled the ROC from the UN. From the United Nations' perspective the "Republic of China" is not a former member. No UN member was expelled in 1971. Rather, the credentials of one Chinese delegation (from Taipei) were rejected and the credentials of another Chinese delegation (from Beijing) were accepted.[citation needed]

In addition to losing its seat in the UN, the UN Secretary-General concluded from the resolution that the General Assembly considered Taiwan to be a province of China. Consequently, the Secretary-General decided that it was not permitted for the ROC to become a party to treaties deposited with it.[21]

In 1993 the ROC began campaigning to rejoin the UN separately from the People's Republic of China. A number of options were considered, including seeking membership in the specialized agencies, applying for observer status, applying for full membership, or having resolution 2758 revoked to reclaim the seat of China in the UN.[22]

Every year from 1993–2006, UN member states submitted a memorandum to the UN Secretary-General requesting that the UN General Assembly consider allowing the ROC to resume participating in the United Nations.[23][note 30] This approach was chosen, rather than a formal application for membership, because it could be enacted by the General Assembly, while a membership application would need Security Council approval, where the PRC held a veto.[22] Early proposals recommended admitting the ROC with parallel representation over China, along with the People's Republic of China, pending eventual reunification, citing examples of other divided countries which had become separate UN member states, such as East and West Germany and North and South Korea. Later proposals emphasized that the ROC was a separate state, over which the PRC had no effective sovereignty. These proposed resolutions referred to the ROC under a variety of names: "Republic of China in Taiwan" (1993–94), "Republic of China on Taiwan" (1995–97, 1999–2002), "Republic of China" (1998), "Republic of China (Taiwan)" (2003) and "Taiwan" (2004–06).

However, all fourteen attempts were unsuccessful as the General Assembly's General Committee declined to put the issue on the Assembly's agenda for debate, under strong opposition from the PRC.[24]

While all these proposals were vague, requesting the ROC be allowed to participate in UN activities without specifying any legal mechanism, in 2007 the ROC submitted a formal application under the name "Taiwan" for full membership in the UN.[25] However, the application was rejected by the United Nations Office of Legal Affairs citing General Assembly Resolution 2758,[26] without being forwarded to the Security Council. Secretary-General of the United NationsBan Ki-moon stated that:

The position of the United Nations is that the People's Republic of China is representing the whole of China as the sole and legitimate representative Government of China. The decision until now about the wish of the people in Taiwan to join the United Nations has been decided on that basis. The resolution (General Assembly Resolution 2758) that you just mentioned is clearly mentioning that the Government of China is the sole and legitimate Government and the position of the United Nations is that Taiwan is part of China.[27]

Responding to the UN's rejection of its application, the ROC government has stated that Taiwan is not now nor has it ever been under the jurisdiction of the PRC, and that since General Assembly Resolution 2758 did not clarify the issue of Taiwan's representation in the UN, it does not prevent Taiwan's participation in the UN as an independent sovereign nation.[28] The ROC government also criticized Ban for asserting that Taiwan is part of China and returning the application without passing it to the Security Council or the General Assembly,[29] contrary to UN's standard procedure (Provisional Rules of Procedure of the Security Council, Chapter X, Rule 59).[30] On the other hand, the PRC government, which has stated that Taiwan is part of China and firmly opposes the application of any Taiwan authorities to join the UN either as a member or an observer, praised that UN's decision "was made in accordance with the UN Charter and Resolution 2758 of the UN General Assembly, and showed the UN and its member states' universal adherence to the one-China principle".[31] A group of UN member states put forward a draft resolution for that fall's UN General Assembly calling on the Security Council to consider the application.[25]

The following year two referendums in Taiwan on the government's attempts to regain participation at the UN did not pass due to low turnout. That fall the ROC took a new approach, with its allies submitting a resolution requesting that the "Republic of China (Taiwan)" be allowed to have "meaningful participation" in the UN specialized agencies.[32] Again the issue was not put on the Assembly's agenda.[24] In 2009, the ROC chose not to bring the issue of its participation in the UN up for debate at the General Assembly for the first time since it began the campaign in 1993.[33]

Czechoslovakia joined the UN as an original member on 24 October 1945, with its name changed to the Czech and Slovak Federative Republic on 20 April 1990. Upon the imminent dissolution of Czechoslovakia, in a letter dated 10 December 1992, its Permanent Representative informed the United Nations Secretary-General that the Czech and Slovak Federative Republic would cease to exist on 31 December 1992 and that the Czech Republic and Slovakia, as successor states, would apply for membership in the UN. Neither state sought sole successor state status. Both states were admitted to the UN on 19 January 1993.[35]

Tanganyika was admitted to the UN on 14 December 1961, and Zanzibar was admitted to the UN on 16 December 1963. Following the ratification on 26 April 1964 of the Articles of Union between Tanganyika and Zanzibar, the two states merged to form the single member "United Republic of Tanganyika and Zanzibar", with its name changed to the United Republic of Tanzania on 1 November 1964.[35][5]

Both Egypt and Syria joined the UN as original members on 24 October 1945. Following a plebiscite on 21 February 1958, the United Arab Republic was established by a union of Egypt and Syria and continued as a single member. On 13 October 1961, Syria, having resumed its status as an independent state, resumed its separate membership in the UN. Egypt continued as a UN member under the name of the United Arab Republic, until it reverted to its original name on 2 September 1971. Syria changed its name to the Syrian Arab Republic on 14 September 1971.[35]

Yemen (i.e., North Yemen) was admitted to the UN on 30 September 1947; Southern Yemen (i.e., South Yemen) was admitted to the UN on 14 December 1967, with its name changed to the People's Democratic Republic of Yemen on 30 November 1970, and was later referred to as Democratic Yemen. On 22 May 1990, the two states merged to form the Republic of Yemen, which continued as a single member under the name Yemen.[35]

The Socialist Federal Republic of Yugoslavia disintegrated into several states starting in the early 1990s. By 2006, six UN member states existed in its former territory. Kosovo declared independence in 2008.

The Socialist Federal Republic of Yugoslavia, referred to as Yugoslavia, joined the UN as an original member on 24 October 1945. By 1992, it had been effectively dissolved into five independent states, which were all subsequently admitted to the UN:

Due to the dispute over its legal successor states, the member state "Yugoslavia", referring to the former Socialist Federal Republic of Yugoslavia, remained on the official roster of UN members for many years after its effective dissolution.[35] Following the admission of all five states as new UN members, "Yugoslavia" was removed from the official roster of UN members.

The government of the Federal Republic of Yugoslavia, established on 28 April 1992 by the remaining Yugoslav republics of Montenegro and Serbia,[39] claimed itself as the legal successor state of the former Socialist Federal Republic of Yugoslavia;[40] however, on 30 May 1992, United Nations Security Council Resolution 757 was adopted, by which it imposed international sanctions on the Federal Republic of Yugoslavia due to its role in the Yugoslav Wars, and noted that "the claim by the Federal Republic of Yugoslavia (Serbia and Montenegro) to continue automatically the membership of the former Socialist Federal Republic of Yugoslavia in the United Nations has not been generally accepted,"[41] and on 22 September 1992, United Nations General Assembly Resolution A/RES/47/1 was adopted, by which it considered that "the Federal Republic of Yugoslavia (Serbia and Montenegro) cannot continue automatically the membership of the former Socialist Federal Republic of Yugoslavia in the United Nations," and therefore decided that "the Federal Republic of Yugoslavia (Serbia and Montenegro) should apply for membership in the United Nations and that it shall not participate in the work of the General Assembly".[42][43] The Federal Republic of Yugoslavia refused to comply with the resolution for many years, but following the ousting of PresidentSlobodan Milošević from office, it applied for membership, and was admitted to the UN on 1 November 2000.[38] On 4 February 2003, the Federal Republic of Yugoslavia had its official name changed to Serbia and Montenegro, following the adoption and promulgation of the Constitutional Charter of Serbia and Montenegro by the Assembly of the Federal Republic of Yugoslavia.[44]

A Member of the United Nations against which preventive or enforcement action has been taken by the Security Council may be suspended from the exercise of the rights and privileges of membership by the General Assembly upon the recommendation of the Security Council. The exercise of these rights and privileges may be restored by the Security Council.

A Member of the United Nations which has persistently violated the Principles contained in the present Charter may be expelled from the Organization by the General Assembly upon the recommendation of the Security Council.

Since its inception, no member state has been suspended or expelled from the UN under Articles 5 or 6. However, in a few cases, states were suspended or expelled from participating in UN activities by means other than Articles 5 or 6:

On 25 October 1971, United Nations General Assembly Resolution 2758 was adopted, which recognized the People's Republic of China instead of the Republic of China (since 1949 controlling only Taiwan) as the legitimate representative of China in the UN and effectively expelled the Republic of China from the UN in 1971 (see the section Former members: Republic of China). This act did not constitute as the expulsion of a member state under Article 6, as this would have required Security Council approval and been subjected to vetoes by its permanent members, which included the Republic of China itself and the United States, which at that time still recognized the Republic of China.[50]

In October 1974, the Security Council considered a draft resolution that would have recommended that the General Assembly immediately expel South Africa from the UN, in compliance with Article 6 of the United Nations Charter, due to its apartheid policies.[35] However, the resolution was not adopted because of vetoes by three permanent members of the Security Council: France, the United Kingdom, and the United States. In response, the General Assembly decided to suspend South Africa from participation in the work of the Assembly's 29th session on 12 November 1974; however, South Africa was not formally suspended under Article 5. The suspension lasted until the General Assembly welcomed South Africa back to full participation in the UN on 23 June 1994, following its successful democratic elections earlier that year.[51]

On 28 April 1992, the new Federal Republic of Yugoslavia was established, by the remaining republics of Serbia and Montenegro of the former Socialist Federal Republic of Yugoslavia. On 22 September 1992, United Nations General Assembly Resolution A/RES/47/1 was adopted, by which it considered that "the Federal Republic of Yugoslavia (Serbia and Montenegro) cannot continue automatically the membership of the former Socialist Federal Republic of Yugoslavia in the United Nations," and therefore decided that "the Federal Republic of Yugoslavia (Serbia and Montenegro) should apply for membership in the United Nations and that it shall not participate in the work of the General Assembly". It did not apply for membership until Slobodan Milošević was ousted from the presidency and was admitted on 1 November 2000 (see the section Former members: Yugoslavia).

Indonesian president Sukarno's decision to withdraw from the United Nations in 1965 is the only instance of a withdrawal of membership in UN history. Indonesia rejoined the UN a year later.

Since the inception of the UN, only one member state (excluding those that dissolved or merged with other member states) has unilaterally withdrawn from the UN. During the Indonesia–Malaysia confrontation, and in response to the election of Malaysia as a non-permanent member of the United Nations Security Council, in a letter dated 20 January 1965, Indonesia informed the United Nations Secretary-General that it had decided "at this stage and under the present circumstances" to withdraw from the UN. However, following the overthrow of PresidentSukarno, in a telegram dated 19 September 1966, Indonesia notified the Secretary-General of its decision "to resume full cooperation with the United Nations and to resume participation in its activities starting with the twenty-first session of the General Assembly". On 28 September 1966, the United Nations General Assembly took note of the decision of the Government of Indonesia and the President invited the representatives of that country to take their seats in the Assembly.[35]

Unlike suspension and expulsion, no express provision is made in the United Nations Charter of whether or how a member can legally withdraw from the UN (largely to prevent the threat of withdrawal from being used as a form of political blackmail, or to evade obligations under the Charter, similar to withdrawals that weakened the UN's predecessor, the League of Nations),[50] or on whether a request for readmission by a withdrawn member should be treated the same as an application for membership, i.e., requiring Security Council as well as General Assembly approval. Indonesia's return to the UN would suggest that this is not required; however, scholars have argued that the course of action taken by the General Assembly was not in accordance with the Charter from a legal point of view.[52]

The Holy See holds sovereignty over the state of Vatican City and maintains diplomatic relations with 180 other states. It has been an observer state since 6 April 1964,[54] and gained all the rights of full membership except voting on 1 July 2004.[55]

A number of states were also granted observer status before being admitted to the UN as full members.[67][68][69] The most recent case of an observer state becoming a member state was Switzerland, which was admitted in 2002.[70]

A European Union institution, the European Commission, was granted observer status at the UNGA through Resolution 3208 in 1974. The Treaty of Lisbon in 2009 resulted in the delegates being accredited directly to the EU.[71] It was accorded full rights in the General Assembly, bar the right to vote and put forward candidates, via UNGA Resolution A/RES/65/276 on 10 May 2011.[72] It is the only non-state party to over 50 multilateral conventions, and has participated as a full member in every way except for having a vote in a number of UN conferences.[73]

^Cabo Verde: Previously referred to as Cape Verde. On 24 October 2013, Cabo Verde requested that its name no longer be translated into different languages.[15]

^Cambodia: Name was changed to the Khmer Republic on 7 October 1970, and back to Cambodia on 30 April 1975. Name was changed again to Democratic Kampuchea on 6 April 1976, and back to Cambodia on 3 February 1990.

^Cameroon: Previously referred to as Cameroun (before merging with Southern Cameroons in 1961). By a letter of 4 January 1974, the Secretary-General was informed that Cameroon had changed its name to the United Republic of Cameroon. Name was changed back to Cameroon on 4 February 1984.

^Central African Republic: By a letter of 20 December 1976, the Central African Republic advised that it had changed its name to the Central African Empire. Name was changed back to the Central African Republic on 20 September 1979.

^Congo: Previously referred to as Congo (Brazzaville) (to differentiate it from Congo (Leopoldville)) and the People's Republic of the Congo. Name was changed to Congo on 15 November 1971 (after the Democratic Republic of the Congo changed its name to Zaire). Also referred to as Congo (Republic of the).

^Côte d'Ivoire: Previously referred to as Ivory Coast. On 6 November 1985, Côte d'Ivoire requested that its name no longer be translated into different languages; this became fully effective on 1 January 1986.

^Democratic Republic of the Congo: Previously referred to as Congo (Leopoldville) (to differentiate it from Congo (Brazzaville)). Name was changed from the Democratic Republic of the Congo to Zaire on 27 October 1971, and back to the Democratic Republic of the Congo on 17 May 1997.

^Withdrew from the UN on 20 January 1965. It rejoined on 28 September 1966.

^Islamic Republic of Iran: Previously referred to as Iran. By a communication of 5 March 1981, Iran informed the Secretary-General that it should be referred to by its complete name of the Islamic Republic of Iran.

^Lao People's Democratic Republic: Name was changed from Laos on 2 December 1975.

^Libya: Formerly recognised as the Libyan Arab Republic from 1969 after originally being admitted as Libya. By notes verbales of 1 and 21 April 1977, the Libyan Arab Republic advised that it had changed its name to the Libyan Arab Jamahiriya. On 16 September 2011, the UN General Assembly awarded the UN seat to the National Transitional Council, thereby restoring the original name of Libya.

^"FINAL CLAUSES OF MULTILATERAL TREATIES"(PDF). United Nations. 2003. Retrieved 2016-04-25. Hence, instruments received from the Taiwan Province of China will not be accepted by the Secretary-General in his capacity as depositary.